US5206132AExpiredUtility
Direct positive silver halide photographic light-sensitive material
Est. expiryMay 14, 2010(expired)· nominal 20-yr term from priority
Inventors:Tsuyoshi Mitsuhashi
G03C 1/48515Y10S430/164G03C 1/485
65
PatentIndex Score
6
Cited by
5
References
5
Claims
Abstract
A direct positive silver halide photographic light-sensitive material which is improved in gradation and suitable for rapid processing comprises a support having thereon a silver halide emulsion layer containing surface-fogged type direct positive silver halide grains, wherein said direct positive silver halide emulsion layer comprises two or more silver halide emulsions substantially different in sensitivity and/or gradation; the ratio of the total area of (111) face to and total surface area of grains in said emulsions is not less than 50%; and the average silver iodide content of grains in said emulsions is not more than 5 mol%.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A direct positive silver halide photographic light-sensitive material comprising a support having thereon a silver halide emulsion layer containing surface-fogged type direct positive silver halide grains, wherein said direct positive silver halide emulsion layer comprises two or more silver halide emulsions substantially different in sensitivity and/or gradation; the ratio of the total area of (111) face to the total surface area of grains in said emulsions is not less than 50%; the average silver iodide content of grains in said emulsions is not more than 5 mol %; and wherein said photographic material is processed with an automatic processing machine for an overall processing time of more than 20 seconds and less than 60 seconds.
2. A photographic material of claim 1, wherein said area ratio of (111) face is not less than 70%.
3. A photographic material of claim 2, wherein said ratio is not less than 80%.
4. A photographic material of claim 1, wherein said silver iodide content is not more than 2 mol %.
5. A photographic material of claim 1, wherein said silver halide grains contain an inorganic densitizer of rhodium salts and/or iridium salts in an amount of 10 -8 to 10 -2 mol per mol of silver halide.Cited by (0)
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References (0)
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